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. 2020 Jun 4;7:268. doi: 10.3389/fvets.2020.00268

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Copyright © 2020 Luo, Reimert, Middelkoop, Kemp and Bolhuis.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Timeline of the observations. Pigs were housed in either barren (B1) or enriched (E1) pens from birth, and half of them experienced a housing switch at 47 days of age, creating four groups: B1B2, B1E2, E1E2, and E1B2.